PHP配列をソートするにはどのような方法がありますか?

$numbers = array(4, 2, 8, 6);
sort($numbers);
print_r($numbers); // Output: Array ( [0] => 2 [1] => 4 [2] => 6 [3] => 8 )

$numbers = array(4, 2, 8, 6);
rsort($numbers);
print_r($numbers); // Output: Array ( [0] => 8 [1] => 6 [2] => 4 [3] => 2 )

$age = array("Peter" => "35", "Ben" => "37", "Joe" => "43");
asort($age);
print_r($age); // Output: Array ( [Peter] => 35 [Ben] => 37 [Joe] => 43 )

$age = array("Peter" => "35", "Ben" => "37", "Joe" => "43");
ksort($age);
print_r($age); // Output: Array ( [Ben] => 37 [Joe] => 43 [Peter] => 35 )

$age = array("Peter" => "35", "Ben" => "37", "Joe" => "43");
arsort($age);
print_r($age); // Output: Array ( [Joe] => 43 [Ben] => 37 [Peter] => 35 )